Android Open Source - 4est Rotors

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Back to project page 4est.

License

The source code is released under:

MIT License

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Java Source Code

package com.wordsaretoys.forest;
//from w  ww.  j av a  2 s.  c  o  m
import java.util.Random;

import android.opengl.Matrix;

import com.wordsaretoys.rise.geometry.Vector;
import com.wordsaretoys.rise.utility.Interval;
import com.wordsaretoys.rise.utility.Misc;

/**
 * provides an array of random rotations for animations
 */

public class Rotors {

  public static final int RotorCount = 48;

  class AngularVelocity {
    float x;
    float y;
    float z;
    float w;
  }

  AngularVelocity[] angv;
  float[] rotations, matrixes;

  Interval interval;
  double time;
  
  public Rotors() {

    Random rng = new Random();
    
    rotations = new float[RotorCount * 16];
    for (int i = 0; i < RotorCount; i++) {
      Matrix.setIdentityM(rotations, i * 16);
    }
    
    angv = new AngularVelocity[RotorCount];
    Vector p = new Vector();
    for (int i = 0; i < RotorCount; i++) {
      p.set(  2 * rng.nextFloat() - 1, 
          2 * rng.nextFloat() - 1, 
          2 * rng.nextFloat() - 1 ).norm();
      angv[i] = new AngularVelocity();
      angv[i].x = p.x;
      angv[i].y = p.y;
      angv[i].z = p.z;
      angv[i].w = rng.nextFloat() * 100;
    }
    
    matrixes = new float[RotorCount * 9];

    interval = new Interval();
    time = 10 * Math.random();
  }
  
  public void update() {
    time += interval.next();
    for (int i = 0; i < RotorCount; i++) {
      AngularVelocity av = angv[i];
      Matrix.setRotateM(rotations, i * 16, (float)(av.w * time), av.x, av.y, av.z);
      Misc.copyM4To3(matrixes, i * 9, rotations, i * 16);
    }
  }
  
}

Java Source Code List